Melvin is chasing a suspect and pulls his tracksuit top. The suspect had caused a disturbance after being caught fishing for something in a pond - a wrapped up gun shape but when the wrapping is removed it turns out to be a diamond necklace instead. Turnham talks to Norika on the way to a break-in although there are no signs of forced entry and the only thing missing is a ring. Tosh investigates and ties together both jewelry thefts. Turnham and Norika get involved in a fight in a pub.